[mac] Send the system spellchecker language to the renderer.

chrome/browser/spellchecker/spellcheck_platform_mac.mm

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Integration with OS X built-in spellchecker.
 
 #include "chrome/browser/spellchecker/spellcheck_platform.h"
 
 #import <Cocoa/Cocoa.h>
 
@@ skipping 91 matching lines @@
 namespace spellcheck_platform {
 
 void GetAvailableLanguages(std::vector<std::string>* spellcheck_languages) {
   NSArray* availableLanguages = [SharedSpellChecker() availableLanguages];
   for (NSString* lang_code in availableLanguages) {
     spellcheck_languages->push_back(
               ConvertLanguageCodeFromMac(lang_code));
   }
 }
 
+std::string GetSpellCheckerLanguage() {
+  return base::SysNSStringToUTF8([SharedSpellChecker() language]);

[groby-ooo-7-16, 2016/01/19 23:54:14]

Don't you want to call ConvertLanguageCodeFromMac?

Also, if the user has set the language to "Automatic", what happens here?

[please use gerrit instead, 2016/01/20 02:25:59]

Done.
I have "Automatic by language" selected in Mac spellcheck settings. This
function returns "en" for me. Not sure how Mac determines what to return
internally.

+}
+
 bool SpellCheckerAvailable() {
   // If this file was compiled, then we know that we are on OS X 10.5 at least
   // and can safely return true here.
   return true;
 }
 
 bool SpellCheckerProvidesPanel() {
   // OS X has a Spelling Panel, so we can return true here.
   return true;
 }
@@ skipping 174 matching lines @@
 
 ScopedEnglishLanguageForTest::ScopedEnglishLanguageForTest()
     : state_(new SpellcheckerStateInternal) {
 }
 
 ScopedEnglishLanguageForTest::~ScopedEnglishLanguageForTest() {
   delete state_;
 }
 
 }  // namespace spellcheck_platform